<?php
$db = Database::singleton();

$sth = $db->prepare("SELECT p.nome as nome_professor , t.*, d.* FROM siscad.turma as t
						join siscad.disciplina as d on t.id_disciplina = d.id
						join siscad.professor as p on t.id_professor = p.id
						where t.id = 1";

$sth->execute();

$turma = $sth->fetchAll(PDO::FETCH_OBJ);

$sth = $db->prepare("select * FROM siscad.dias_letivos WHERE id_turma = 1");

print_r($sth);

?>